When experience a cittarupa understand arise if no thoughts come regarding them self will disappears. What is that experience?
Citta-Rupa simply refers to resp. the mind and the body. According to the Abidhamma, this is the everyday human experience where Citta conditions Rupa. What you are referring to as "self will dissapear" is called nirodha samapatti, as detailed in the Abidhamma. It refers to a state of Nirvana while still living in Samsara.
To attain Nirvana, the Abidhamma refers to a specific Citta called Cuti-Citta, this is the mental precognition of physical death:
Even though there is a single nibbana as its nature, nibbana is talked to have two different forms, saupadisesa nibbana and anupadisesa nibbana. Saupadisesa nibbana is nibbana when sattas are still in the samsara are when they are alive. This nibbana is only present in arahats or anagams while they are in nirodha samapatti. Nirodha means disappearance and samapatti means to be in a state of. Anupadisesa nibbana is the state immediately after cuti citta of arahats.
Immediately after cuti citta of arahats, there is no more kammaja rupa, cittaja rupa and aharaja rupa. That state from the sattas just gone to nibbana is said to be the state of nibbana called anupadisesa nibbana as there is no trace of so called satta that is no citta, no cetasika, no kammaja rupa, no citta rupa, and no aharaja rupa. Utuja rupa just left is like other bahiddhika rupa and not attached to any satta. So such nibbana is a complete and absolute peace. This is the state all Buddhists are trying to attain after their paccima bhava or final life .
Note that in Theravada Buddhism Nirvana without residing in Samsara can only be attained upon physical death. In Mahayana Buddhism, this "requirement" is eliminated, though many Mahayana traditions still refer to the moment of enlightenment as "The Great Death".